CTR pistons compresssion ratio
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From: Bay Area, CA, USA
Re: CTR pistons compresssion ratio (01GSR)
it a type r block with type r head the compression is 11.5-11.8 ...in a gsr motor with a gsr head the compression is 12.0-12.3...thats according to my mechanic mike angel from Area 51 Fabrications in Irvine, CA who used to work at JUN USA...
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From: Tampa, FL
Re: CTR pistons compresssion ratio (zentraedityper)
The REAL reason CTR pistons give 10.8:1 CR with a CTR/ITR head is due to the fact that the CTR block is identical to a B18C block...but, the CTR crank has a shorter stroke. So, it is basically like a B18C block destroked.
With this configuration the piston does not come all the way up to the top of the deck. That is the reason a larger dome is necessary to give the 10.8:1 CR of the CTR motor.
The heads are nearly identical. The only difference being the cams and the angles cut into the intake valve seats/valves.
-kenji
With this configuration the piston does not come all the way up to the top of the deck. That is the reason a larger dome is necessary to give the 10.8:1 CR of the CTR motor.
The heads are nearly identical. The only difference being the cams and the angles cut into the intake valve seats/valves.
-kenji
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From: Weed Country, Holland, Netherlands
Re: CTR pistons compresssion ratio (73rd 2000 ITR)
WHAT HEADS ARE NEARLY IDENTICAL? I HATE ALL THIS MISINFORMATION CRAP. 800 ANWSERS FOR 1 QUESTION. RIDICULOUS.
I THOUGHT EVERYBODY SAYS THE TYPE-R AND B16A ARE PRETTY MUCH THE SAME HEADS
[Modified by EuroITR1689, 5:17 PM 8/31/2001]
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From: GTA, ON, Canada
Re: CTR pistons compresssion ratio (73rd 2000 ITR)
b16a, b17a, b16b, b18c5 or jdm b18c (ITR) all use a PR3 head which is the same casting, the difference is in the valve angles, additional port and polish for the Type R cars, the actual volume of the head does not change siginificantly...
GSR or P72 head is a totally different case, this also the reason why the intake from b16a or ITR doesn't bolt up, its also a reason that p72 has different desing of ports and quench area
GSR or P72 head is a totally different case, this also the reason why the intake from b16a or ITR doesn't bolt up, its also a reason that p72 has different desing of ports and quench area
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From: GTA, ON, Canada
Re: CTR pistons compresssion ratio (73rd 2000 ITR)
no b16a on a ITR gives the same c/r as ITR head which is the same as far as casting....this the reason behing building a poorsmans ITR, take a b18c(gsr) block slap some ITR pistons and b16a and you have pretty much an ITR motor (with few expetions)
yes the combustion chamber is smaller on the GSR head (p72)
GSR=41.6 and b16a/ITR=42.7 cc's
yes the combustion chamber is smaller on the GSR head (p72)
GSR=41.6 and b16a/ITR=42.7 cc's
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From: Triangle, NC, USA
Re: CTR pistons compresssion ratio (73rd 2000 ITR)
BUT THE COMBUSTION CHAMBER BOWLS ARE DIFFERENT,, CORRECT??? GIVING DIFFERENT COMP. RATIOS WITH THE SAME PISTONS.
SO THE B16A ON AN INTEGRA TYPE-R BLOCK WOULD LOWER COMPRESSION?? RIGHT... BUT IF YOU HAVE TYPE-R CAMS AND PORT POLISH, VALVE JOB AND RAISE COMPRESSION ( TO STOCK) IT SHOULD BE JUST LIKE A STOCK TYPE-R ENGINE,,RIGHT. AND IF THATS RIGHT THEN THEY REALLY CAN'T BE CALLED THE SAME... RIGHT??? CREATES CONFUSSION ( AT LEAST FOR ME )
SO THE B16A ON AN INTEGRA TYPE-R BLOCK WOULD LOWER COMPRESSION?? RIGHT... BUT IF YOU HAVE TYPE-R CAMS AND PORT POLISH, VALVE JOB AND RAISE COMPRESSION ( TO STOCK) IT SHOULD BE JUST LIKE A STOCK TYPE-R ENGINE,,RIGHT. AND IF THATS RIGHT THEN THEY REALLY CAN'T BE CALLED THE SAME... RIGHT??? CREATES CONFUSSION ( AT LEAST FOR ME )
Same casting is used for both (PR3) and same combustion chamber. Compression will remain unchanged if either is bolted to a stock ITR.
A b18 head (PR2) will yield a higher compression ratio than a PR3 head (on the same bottom end)because the combustion chamber is smaller. I believe this results in a approx. a 0.2-0.3 bump in compression. Example: stock ITR compression (10.6:1) would be raised to 10.8-10.9:1. The ITR intake manifold would not be a direct bolt-on, so the Skunk2 unit would need to be used.
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